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11. Connection to other devices
11.4 Modbus TCP
3. If a byte is not used fully, the unused bits will be padded with 0's.
Once the response is encoded, it is sent.
11.4.2.2 Read Discrete Inputs 0x02:
This function reads a specified number of bit inputs starting from a specified starting
address and then returns the result in bytes (8 inputs per byte)
Function Code
1 byte
0x02 ;Read Discrete Inputs
Start address
2 byte
Must always be 1 less than the starting input you want
(zero-based)
Number of out-
puts
2 byte
1 to 2000 (0x7D0)
Table 96: Request-PDU
Response to the request being received
1. The starting address is analyzed (distributed among bytes 1 and 2)
a. Byte 1 = Hi; Byte 2 = Lo
2. The number of inputs is analyzed (distributed among bytes 3 and 4)
a. Byte 3 = Hi; Byte 4 = Lo
3. The bit input states are read
a. From the start of the (starting address) to (starting a number of bit
inputs)
Function Code
1 byte
0x02 ;Read Discrete Inputs
Bye Count
1 byte
N
Output values
n* 1 Byte
value
Table 97: Response-PDU
n= Number of inputs read / 8
Preparation for sending the response
1. The read bits are encoded in bytes
Bit per input state; 1=ON, 0=OFF)
2. The LSB of the first byte, i.e., bit 0, contains the state of the input that is
addressed first in the request. The other inputs follow in ascending order.
3. If a byte is not used fully, the unused bits will be padded with 0's.
Once the response is encoded, it is sent.
11.4.2.3 Read Holding Registers 0x03:
Function 0x03 reads internal registers (e.g., marker words in the easyE4) word by
word.
548
easyE4
11/18 MN050009 EN www.eaton.com
Содержание easyE4 series
Страница 1: ...Manual 11 18 MN050009 EN easyE4 Manual...
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Страница 22: ...0 1 About this manual 18 easyE4 11 18 MN050009 EN www eaton com...
Страница 40: ...1 easyE4 control relays description 1 10 Safety regulations 36 easyE4 11 18 MN050009 EN www eaton com...
Страница 169: ...easyE4 11 18 MN050009 EN www eaton com 165...
Страница 462: ...6 Function blocks 6 4 Timing and counter relay example 458 easyE4 11 18 MN050009 EN www eaton com...
Страница 490: ...7 System settings 7 16 Time and Date setting 486 easyE4 11 18 MN050009 EN www eaton com...
Страница 520: ...9 easyE4 inside 9 7 NET network 516 easyE4 11 18 MN050009 EN www eaton com...
Страница 524: ...10 Diagnostics messages of the operating system 10 2 Diagnostics buffer 520 easyE4 11 18 MN050009 EN www eaton com...
Страница 570: ...11 Connection to other devices 11 6 E mail function 566 easyE4 11 18 MN050009 EN www eaton com...
Страница 578: ...12 Faults 12 4 Functionality of the NET faulty 574 easyE4 11 18 MN050009 EN www eaton com...
Страница 582: ...13 Maintenance 13 3 Storage transport and disposal 578 easyE4 11 18 MN050009 EN www eaton com...
Страница 594: ...590 easyE4 11 18 MN050009 EN www eaton com...
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